N.M. Stat. § 30-9-18
In any prosecution for criminal sexual penetration or criminal sexual contact of a minor, if the alleged victim is under thirteen years of age, the court may hold an evidentiary hearing to determine whether to order a psychological evaluation of the alleged victim on the issue of competency as a witness. If the court determines that the issue of competency is in sufficient doubt that the court requires expert assistance, then the court may order a psychological evaluation of the alleged victim, provided however, that if a psychological evaluation is ordered it shall be conducted by only one psychologist or psychiatrist selected by the court who may be utilized by either or both parties; further provided that if the alleged victim has been evaluated on the issue of competency during the course of investigation by a psychologist or psychiatrist selected in whole or in part by law enforcement officials, the psychological evaluation, if any, shall be conducted by a psychologist or psychiatrist selected by the court upon the recommendation of the defense.
NMS § 30-9-18